In India, almost every household has a custom of lighting a deepam or diya twice a day — in the morning and evening. This is a part of prayer. All ceremonies, daily worship rituals, auspicious functions, religious occasions as well as new ventures start with lightning of the lamp. Diya is essential in Hinduism because it signifies purity, goodness, good luck and power. The presence of light means the non-existence of darkness and evil forces.